A pragmatic approach to HIV hotspot mapping in a developing country. Thursday, July 13, 2017
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1 A pragmatic approach to HIV hotspot mapping in a developing country Thursday, July 13, 2017
2 Overview of HIV Epidemic Eastern and Southern Africa (ESA) 2016 Source: UNAIDS Estimates 2016
3 Distribution of new HIV infections ESA 2015 Source: UNAIDS estimates 2016
4 Adolescent girls and young women accounted for 25% of new HIV infections among adults (15+y) in the ESA region: about 4500 weekly Estimated number of new HIV infections per week among females years Source: UNAIDS estimates 2016
5 Adolescent boys and young men accounted for 12% of new HIV infections among adults (15+y) in the ESA region: about 2200 weekly Estimated number of new HIV infections per week among males years Source: UNAIDS estimates 2016
6 Developing a spatial model for HIV hotspots
7
8 Reaching consensus
9 Pilot Project : umgungundlovu
10 Pilot Project : Cape Winelands
11 Data Sources District Health Information System TIER.net (Electronic HIV database) exports to DHIS Aggregations form Antenatal registers Routine health data at health facility level South Africa Census 2011 for population data
12 Routine health indicators Strengths Similar behaviour for collection, management and storage Available for whole country Limitations Can t be disaggregated for sax and age Mobile clinic data recorded as point not points on route
13 Workflow Step 1: Convert spreadsheet received into point shapefile. The following fields were used base the analysis on. Data is represented in the form of percentage of proportions of the tested population: child months; (HIVP1259) child 5-14 years; (HIVP514R) client years (excluding ANC); assumed correct (HP_14_59) client 50 years and older (excluding ANC); (no field) antenatal clients; (ANCHIV1P) PCR Tests (INFPCR2P) Tests positive for infants - birth + at 6 weeks (TABPCRPR)
14 Workflow Step 2: Apply an interpolation algorithm to each selected criteria, in this instance Ordinary Kriging (Gaussian option), using a Variable distance of 12 and cell and lag size of Step 3: Apply an interpolation algorithm to each selected criteria, in this instance using Ordinary Kriging (with a Gaussian option), using a Fixed distance of (5 kms) Step 4: Visualise the modelling results as a data layer per criteria, for each of the Kriging types noted in Steps 2 and 3 Step 5: Normalise the results by averaging the data per subdistrict The final method used was Kriging, gaussian option, variable distance of 12 with cell size of
15 Scenarios developed after initial modelling Where each of the criteria A to E each weighs 20% when overlayed (i.e. equal weighting to all); Where criteria C client years weighs 60% while the remainder each weighs 10%; Where criteria E % of antenatal clients testing positive for HIV/AIDS weighs 60% while the remainder each weighs 10%; Where criteria A and B each weighs 30% while the remainder each weighs 10%; Where criteria C and E each weighs 30% while the remainder each weighs 10%;
16 Data analysis Literature review conducted to determine suitability of kriging to health statistics such as that which this project considers Discussions with experts on application of interpolation in general as well as kriging Empirical smoothing/interpolation was applied: among others, Inverse Distance Weighting (IDW) and Natural neighbour (NN) did not present suitable results; Kriging provided feasible representations Spatial weight matrix: methods tested and implemented Average per sub-district and facility catchment area (using Thiessen polygons) not used in the final model
17 Final deliverable for HIVP1259
18 Important to remember Future developments - overlay budget distribution and programme intervention areas may reveal additional insights Catchment population in terms of age and sex (gender), using the Census data (STATSSA, 2011 or variants thereof) based on household surveys can be incorporated in the model at a later stage it is not included at this time Modelling process is run on a flat unfeatured earth surface Topographical features such as cliffs, rivers and steep valleys, as well as the location of densely populated area and different road classes is considered to have a major impact on the distribution and hot spot occurrence of HIV and AIDS include in future modelling
19 Important items to remember While summation provides a wider-scale interpretation of the model, multiplication focus the importance of specific parameters in specific areas. Multiplication therefore enhances any outliers or data that has consistently high values across the set of criteria
20 Alternate Data Sources Western Cape Province makes use of a unique patient identifier to link and harmonise individualised patient data Patient Master Index (PMI) has matured over last 20 years aligned to the future strategy for individualised health data in South Africa as a whole Ideal prototyping space for geospatially mapping the burden of HIV according to the actual patient address, rather than from assumptions around the primary health care facility. The PMI also includes patient demographic info PMI also allows for analysis of sub-groups, such as Young Women & Girls (15 24 years)
21 Cascades Comprehensive patient level view of episodes, including key dates, evidence, outcomes and co-morbidities relevant for patient management Provides us with a cohort in the absence of complete registers Optimised for operational and management purposes Easily aggregated by region or attributes + Other Episode of Interest Start date Treatment date Last date Outcome episodes (co-morbidities) + ++ = Service utilisation outcomes Episode-specific outcomes Cascade Selected attributes Vital status outcomes
22 Workflow for Harmonised Geospatial Health Data using Street Postal Code Determine population estimates for postal code polygons: Use the Overlay Analysis tool for the Small Area polygon layer and the Street Postal Code polygon layer using the Union operation Manual method avoids mistakes where there are multiple distinct overlapping areas between a small area and a postal code Create new area field in resultant layer and calculate area in required units (km 2 ) using Summary Statistics tool Calculate the proportional population of the Small Area layer that resides within the postal code polygon layer (pro.arcgis.com)
23 Workflow for Harmonised Geospatial Health Data using Street Postal Code Map HIV episodes (PLHIV) by street postal code Import data from Data Centre Server (Western Cape uses Microsoft stack) 3 options: Manual export from MS SQL and import to ArcGIS Direct connection to database View of HIV episodes aggregated to street postal code Semi-automation of most steps with an ArcGIS Model Join street postal code polygon layer to the data table / view
24 Workflow for Harmonised Geospatial Health Data using Street Postal Code Deal with patients with missing or invalid postal codes (10%) Determine last PHC facility visited by the patient Assume patient lives within that the health sub-district (municipal region) of the health facility Follow similar workflow using the Union operation of the Overlay Analysis tool to proportionally assign patients from the sub-district layer to the postal code layer Add appropriate symbology, colour ramp with no more than 5 natural jenks for health managers Visualize: 1. Absolute number of PLHIV per area 2. Standardise by population for urban areas 3. Standardise by area (density) for rural areas
25 Limitations: Workflow for Harmonised Geospatial Health Data using Street Postal Code Street postal code population will not contain SAL population where postal code polygons and SAL polygons did not overlap Postal code does not cover the entire surface of the country, particularly in the rural and agricultural areas Strengths: Fairly reliable in city / urbanised areas Small Area Layer is small enough for the assumption of homogenous distribution of the population
26 Comparison of results Facility level v Patient level Facility Level Anonymized Aggregated Facility Level Data Location: Facility location Sample size: Number of Health facilities Method: Raster maps utilizing the statistical method of interpolating facility level data through a standard Gaussian process Patient Level Anonymized Single Patient data Location: Aggregated from patient addresses to postal code area Sample size: Number of postal areas Method: Thematic Map based on postal code aggregated data standardized according to rurality
27 Comparison of results Facility level v Patient level Two independent methods used to address a common problem Surprisingly similar outcomes Confirmation of common areas for focusing to achieve maximum impact
28 Esri ArcGIS Desktop Advance Utilised to do the heavy lifting Analyses Transformations Iterative evolution and presentation of data Tools used ArcMap Spatial Analyst Kriging Raster Clipping Automation through modelling Publishing of results
29 Esri ArcGIS Advance Server Utilised to host and publish results SQL Geo-spatial DB Raster image server REST API Integration into 3rd party software via API calls Flexibility
30 Lessons learnt The value of the approach is realised when users find it useful for decision-making Focus for Impact tool for coordination, monitoring progress and decision support Inform policy and priorities key approach in South Africa s National Strategic Plan for HIV, TB and STI 2017 to 2022 Need to build local capacity to use/interpret the outcomes of the approach Data is not perfect but sufficient for pragmatic decision making
31 Financial and in kind contributions Development
32 Financial and in kind contributions Attendance of the conference KWAZULU-NATAL PROVINCIAL TREASURY KWAZULU-NATAL GLOBAL FUND SUPPORTED PROGRAMME
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